底板巷穿层钻孔在煤巷掘进中的应用

随着国内煤矿开采技术的不断提高,如何提高开采量及提高开采的效率问题摆在我们面前,随着国家提出了"可保尽保,应抽尽抽"的战略方针,在这个战略方针的指导下,国内各大型煤矿对原煤的开采技术进行了技术挖潜和技术革新,研制成了底板巷穿层钻孔技术,该项技术对煤巷掘进过程中,煤瓦斯突抽放的效果显著,确保矿井的稳产、高产及安全生产。     

基于旅游者角度的中国旅游区划分研究

根据游客消费行为特征中的旅游者访问频率、逗留时间以及旅游景点市场份额之间的关系,本文引入旅游显性比较优势、旅游位序比指数,采用四象限分类法将旅游区分为重点旅游区、深渊旅游区、崛起旅游区和传统旅游区四类。本文进一步结合Bulter的旅游地生命周期理论和Plog的旅游者心理学分类理论研究基于旅游者角度的旅游区划分在旅游市场营销中以及旅游流预测中的应用价值。     

独立挂点双联悬垂绝缘子串在连续上下山时的受力分析及串长调整

输电线路设计过程中,经常会采用独立挂点双联悬垂串的方式,而当独立挂点的双联串出现在连续上下山的杆塔时,往往会出现两悬垂串受力不均,甚至出现一串受力而一串松弛的情况。文章通过采用悬链线公式计算方法对两串受力进行分析,计算出串长的理论调整值,最后结合实际调整值来验算两串的实际受力情况,保证两串均满足规定要求。     

薄煤层工作面高产高效分析

介绍了唐山矿业分公司薄煤层高产高效工作面须具备的条件,详细说明了工作面长度、工作面支护形式、运输系统能力及煤仓容量等的合理确定,以及实现工作面高产高效的条件。     

Ex post implementation

We analyze the problem of fully implementing a social choice set in ex post equilibrium. We identify an ex post monotonicity condition that is necessary and—in economic environments—sufficient for full implementation in ex post equilibrium. We also identify an ex post monotonicity no veto condition that is sufficient. Ex post monotonicity is satisfied in all single crossing environments with strict ex post incentive constraints.We show by means of two classic examples that ex post monotonicity does not imply nor is it implied by Maskin monotonicity. The single unit auction with interdependent valuations is shown to satisfy ex post monotonicity but not Maskin monotonicity. We further describe a Pareto correspondence that fails ex post monotonicity but satisfies Maskin monotonicity.     

蒸汽喷射器最优化设计在工业节能中的应用

本文从蒸汽喷射器的设计参数上模拟最优化的蒸汽喷射器模型,对蒸汽喷射器的引流压力,喉嘴距混合室长度及半径进行了最优化的数值模拟和计算,同时分析它们与蒸汽喷射器的喷射系数的关系。     

“时间总长假设”对广告媒体策划的启示

认知心理学中的“时间总长假设”（Total Time Hypothesis）认为，人们掌握（主要指记忆）一定的信息所需要的时间是基本固定的。当总的时间长度固定时，对于这段时间的分配方式并不影响记忆的效果。本文对这个假设在广告行业中的应用进行了论证。文中所分析的数据采集于对美国观众在2002、2003和2006年进行的有关“超级碗”球赛广告的电话访谈。研究结果显示，当广告的时间总长固定时，广告重复的次数对广告的传播效果没有显著影响，从而印证了时间总长假设。文章对如何在广告媒体策划中应用这一结论也进行了相应的讨论。     

女装前后片原型对位方法的探讨

以日本文化式女装原型为例，分析前后片原型对位与前长、胸省量大小等因素的关系，从而确定出前后片原型的对位范围，并在此基础上，根据不同的服装类型选择正确的对位方法。     

Analysis on Rules of Investment Decision Based on Payback Period of Dynamic Investment

The index of payback period of dynamic investment is an improvement on index of payback period of static investment, which is the problem that the rules to evaluate the project are feasible or not. This paper proves that rules shall be apt when using payback period of dynamic investment to evaluate the project feasibility under the condition of keeping the dynamic evaluation index to evaluate the same scheme and the consistent feasibility.     

Efficiency of Chinese Enterprises

This paper compares the efficiencies across firm ownership types in China. Empirical results show that the non-state-owned enterprises are more efficient than the state-owned enterprises, which provides evidence to support the continued shifting of industry structure from state-owned enterprises to non-state-owned enterprises. Also, the economic gap between the western and coastal regions are found to be related to the variations of performances of ownership types in these regions. In addition, the issue of crossing frontiers and two interesting features of the Byrnes (1985) technique on the separation of across-group and within-group technical efficiency measures are evaluated.